Piston ring



April 19, 1932.

J. NAGY PIsToN RING Filled Aug. ll, 1930 Jaaa@ (774?? atented Apr. 19, 1932 JQSEPH NGY, 0F PHILADELPHIA, PENNSYLVANIA.

PISTON RING Application med August 11,1930. Serial No. 474,349.

My invention relates to new and useful improvements in piston rings and has for its object to so construct such a ring that when iitted in the groove of a piston, it wi-ll be expanded sidewise so as to snugly fit the side walls of the grooves and also be expanded upward so as to firmly bear against the inner wall of the cylinder in which the piston is located.

A further object of the invention is to form the ring in two sections, each section being in the form of a split ring and having a beveled or inclined surface thereon so that when placed upon a spring split rin having corresponding beveled or mcline surfaces, the expansion of the springl ring will force the sections of the spring ring, both outward and sidewise.

With these and other ends in view, this 'invention consists in the details of construction Aand combination of elements hereinafter set forth and then specifically designated by the claim.

In order that those skilled in the art to which this invention appertains may understand how to make and use the same, I will describe its construction in detail, referring by numerals to the accompanying drawings forming, a part of this application, 1n

which Fig. 1 is a perspective view of a piston ring made in accordancewith my invention. F Fig. 2 is an enlarged section of a portion of Fig. 3 is a view similar to Fig. 2, showing a ortion of the split spring ring, the sections o the expansion ring being omitted.

Fig. 4; is a section of a portion of the twoA sections of the expansion ring removed from the spring ring.

Fig. 5'is a section of a portion of a piston and cylinder showing the application of one of the piston rings in one of the grooves in the piston.

In carrylng out my invention as herein embodied, 10 represents a split spring ring, the cross section of its periphery being wedgeshaped, as indicated at 11, so as to provide two inclined surfaces, this ring also has the 'shoulders 12 formed thereon for the purpose hereinafter explained.

13 represents the'two sections of the expansion ringhaving beveled inclined surfaces 14 formed therein corresponding to the inclined surfaces 11 of the spring ring so that when the device is assembled, -the surfaces 14- ride upon the surfaces 11 and when thus as sembled before being placed in a groove 15 of a piston 16, the expansion sections will rest upon the shoulders 12 for convenience in installation, handling, and shipping, but when the ring is placed in a groove in the piston, the expansion sections will be slightly forced toward each other in slight degree by the side walls of the groove, thus causing these sections to ride up the inclined surfaces 11 thereby lifting these sections from off the shoulders 12, it beingunderstood that all of these "movements are very small' since in practice,

the piston is made to have a running fit within the cylinder and but little movement of the expansion sections serves to keep the outer surfaces thereof in snug contact with the inner surface of cylinder. The spring ring is split, as indicated at 16 and the expansion sections are split as indicated at 17 so that the Ithree sections of the ring coact with each other and with the side walls of the groove in the piston to make a perfect backing under spring tension thereby preventing undue wear upon the inner surface of the cylinder or the scoring thereof. v

In practice, it has been found that-this construction of a two-way expansion ring permits the expansion section to be made of relatively soft material, such as brass or aluminum, thus lessening the wear upon the inner surface of the cylinder.

Rings made in accordance with my improvements are simple and cheap of construction, being more durahle and therefore efect a considerable saving in re air.

Of course I do not wish to he 'mited to the exact details of construction as herein :shown9 as these may be varied within the limits of the appended claim without departing from. the spirit of my invention.

-Hevin thus fully described by invention, what I c aim as new and'useul is A device of the character described consisting of a split spring ring includin two integral walls dverging toward their ee edges 4and shoulders projectin from the outer surfaces of said walls at t e free edgesand a pair of s lit ring sections mounted on the outside o said walls for coaction with the shoulders.

In testimony fixed my signature.

` JOSEPH NAGY.

whereof, I have hereunto afy 

